查询的第一行只是为FOAF定义PREFIX，这样就不必每次都用完整名称引用它。
The first line of the query simply defines a PREFIX for the FOAF namespace, so that you don't have to type it in full each time it is referenced.
每次启动Felix运行时，都会提示配置文件名称。
Every time you start the Felix run time, it prompts you for the profile name.
但是如果我想在每次检索或设置客户名称时都记录日志，会发生什么呢？
But what happens if I want to log every time the name of the customer is retrieved or set?
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